/**
* 解析对象形式的json字符串
*/
public static void test1() {
String jsonStr = "{\"JACKIE_ZHANG\":\"张学友\",\"ANDY_LAU\":\"刘德华\",\"LIMING\":\"黎明\",\"Aaron_Kwok\":\"郭富城\"}";
JSONObject jsonObject = JSONObject.parseObject(jsonStr);
System.out.println(jsonObject.get("JACKIE_ZHANG"));
System.out.println(jsonObject.get("ANDY_LAU"));
System.out.println(jsonObject.get("LIMING"));
System.out.println(jsonObject.get("Aaron_Kwok"));
}
/**
* 解析集合形式的json字符串
*/
public static void test2() {
String jsonStr = "[{\"JACKIE_ZHANG\":\"张学友\"},{\"ANDY_LAU\":\"刘德华\"},{\"LIMING\":\"黎明\"},{\"Aaron_Kwok\":\"郭富城\"}]";
JSONArray jsonArray = JSONArray.parseArray(jsonStr);
JSONObject jsonObject = JSONObject.parseObject(jsonArray.get(0)+"");
System.out.println(jsonObject.get("JACKIE_ZHANG"));
}
/**
* 将对象转换为JSON字符串
*/
public static void test3() {
UserInfo info = new UserInfo();
info.setName("zhangsan");
info.setAge(24);
String str_json = JSON.toJSONString(info);
System.out.println("JSON=" + str_json);
}
/**
* 将复杂的字符串转换成字符串
*/
public static void test4() {
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("username", "zhangsan");
map.put("age", 24);
map.put("sex", "男");
// map集合
HashMap<String, Object> temp = new HashMap<String, Object>();
temp.put("name", "xiaohong");
temp.put("age", "23");
map.put("girlInfo", temp);
// list集合
List<String> list = new ArrayList<String>();
list.add("爬山");
list.add("骑车");
list.add("旅游");
map.put("hobby", list);
String jsonString = JSON.toJSONString(map);
System.out.println("JSON=" + jsonString);
}
/**
* 将json字符串转换成bean对象
*/
public static void test5() {
String json = "{\"name\":\"chenggang\",\"age\":24}";
UserInfo userInfo = JSON.parseObject(json, UserInfo.class);
System.out.println("name:" + userInfo.getName() + ", age:" + userInfo.getAge());
}
/** 泛型的反序列化 */
public static void test6() {
String json = "{\"user\":{\"name\":\"zhangsan\",\"age\":25}}";
Map<String, UserInfo> map = JSON.parseObject(json, new TypeReference<Map<String, UserInfo>>() {
});
System.out.println(map.get("user").getAge());
}
/**
* 时间的序列化
*/
public static void test7() {
Date date = new Date();
// 输出毫秒值
System.out.println(JSON.toJSONString(date));
// 默认格式为yyyy-MM-dd HH:mm:ss
System.out.println(JSON.toJSONString(date, SerializerFeature.WriteDateUseDateFormat));
// 根据自定义格式输出日期
System.out.println(JSON.toJSONStringWithDateFormat(date, "yyyy-MM-dd", SerializerFeature.WriteDateUseDateFormat));
}